Nonskid Spike Structure

ABSTRACT

A nonskid spike structure is molded with the sole of a snowshoe or particular nonskid shoe, mainly comprising a large top end plate on the top edge of a metal spike body at the sole face and a middle plate with a smaller diameter spaced apart therefrom and positioned below the lower edge thereof, thereby forming a double-layer top edge. A central spike rod is extended downward with a convex spike head rod from the bottom thereof, allowing it to be inserted in a mold directly and integrated with the rubber sole upon molding, achieving the simple positioning in the mold and molding without deflection upon pressing, thereby allowing sole rubber material to cover the spike body directly. Whereby, the spike will not take off through the stable combination of the double plate edge and sole material, achieving the nonskid and safe effect upon the treading of the spikes on an icy surface.

(a) TECHNICAL FIELD OF THE INVENTION

The present invention relates to a nonskid spike structure, mainly configuring a larger top end plate on the top of a metal spike body in a sole and a middle plate with a smaller diameter spaced apart therefrom to form a double-layer large head plate type of nonskid spike, which can be placed in a sole mold directly to integrate with rubber sole material to be molded, thereby forming a nonskid and safety spike structure, which is simple to be positioned in the mold, stable in combination, safe and anti-take off.

(b) DESCRIPTION OF THE PRIOR ART

General shoe soles are difficult to walk safely and stably on an icy ground or slippery surface; walking on a snow ground needs specially designed shoes with spikes, otherwise the motion will be difficult and unsafe due to skid. The general nonskid designs of snowshoes and footwear used on ice grounds are provided in many documents such as U.S. Pat. No. 5,634,283, in which a T-typed metal spike with a slightly convex thin rod-typed protrusion on the bottom thereof are placed in a rubber sole mold, and molded with rubber sole material directly together. In such kind of spike covering and positioning structure, the spike will press the inner edge of the sole reversely to form a local convex protrusion directly on the sole at the place where the spike is located, resulting in partial foot discomfort or even worse, damaging a foot because the spike is object to a overlarge instant reactive force generated when treading with a large pressure on a uneven ground due to the metal spike has a large hardness but the rubber is not rigid enough after the spike is covered by the rubber sole. In addition, the spikes are required to insert and position inside sole mold cavities one by one upon molding; it is labor consuming and depends on skills because the spike is very thin and small plus the spike rod is very short. Especially the spike rod is liable to be deflected after molding to influence the nonskid and grip effects seriously upon sole treading if the spike rod is not inserted deeply enough or mated obliquely, or because of the material flow. Furthermore, since the whole spike is covered by the rubber within a limited length, only depending on the spike head end plate to take an anti-take off role, it is liable to be deflected due to a local point is object to an overlarge force when treading on an icy ground surface. When the spike is inserted obliquely, it is more possible that the whole spike is taken off and drops out because the spike is not covered long enough

To improve the deficit of the bad use of the patent mentioned above, Taiwan Patent No. M403908 is proposed, titled “nonskid spike structure”, which covers a spike body of a spike with rubber of higher hardness ranged from 65 to 80 A on the outer circumference thereof to form a cylindrical rod-typed rubber spike, allowing it to have a hard annular rubber surface with a larger diameter, thereby overcoming the deficit of a conventional spike rod being too thin, too short and thus uneasy to be inserted and positioned within a mold. Furthermore, the rubber binding of the spike is allowed to achieve a safe and accurate effect due to the annular rubber surface with a large diameter, overcoming substantially the deflection and spike-take off phenomena and thus bad nonskid effect of conventional spikes. However, the manufacturing thereof must be divided into two stages. Namely, the harder rubber must be covered on a spike in advance to form a rubber-typed spike with a larger diameter first, and the premade spike is then placed within a sole for molding process. Therefore, there is room for improvement.

SUMMARY OF THE INVENTION

To overcome the deficit mentioned above and improve a spike structure under the designs of the molding structures of the current soles, the present invention is proposed.

The main object of the present invention is to provide a nonskid spike structure, configuring an end plate and a middle plate spaced apart from each other on the top edge of a hard rigid metal spike, allowing the spike to be held and positioned conveniently, and to be covered completely with rubber sole material while being integrated with the sole upon molding, achieving an anti-take off effect of layered force. Whereby, the whole nonskid sole is simpler in molding manufacturing, less in cost, and has both nonskid and safe effects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a nonskid spike structure according to the present invention;

FIG. 2 is a cross-sectional view of a spike molded with a sole according to the present invention;

FIG. 3 is a perspective view of the sole with the nonskid spikes distributed therein according to the present invention;

FIG. 4 is a partly enlarged view of the sole with the spike shown in FIG. 3;

FIG. 5 is a perspective view of the spike combined with an elastic element according to the present invention;

FIG. 6 is a cross-sectional view of the sole molded with the spike with the elastic element according to the present invention;

FIG. 7 is an exploded view of a nonskid spike structure according to the present invention;

FIG. 8 is a cross-sectional view of the spike structure shown in FIG. 7 molded with a sole.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A nonskid spike structure of the present invention mainly provides slip resistance for the sole surfaces of general snowshoes or anti-slip rubber and plastic shoes used on icy surfaces. Referring to FIGS. 1 to 4, the whole nonskid structure for a sole surface is to place spike bodies 10 directly into respective pre-arranged accepting grooves 22 on a sole mold 21 to integrate with a sole body 20 when the sole body 20 is molded into shape. The spike structure of the present invention mainly is to configure a top end plate 11 with a larger annular diameter on the hard metal spike body 10, the surface of the plate 11 being configured with arranged through holes 12 for the passed-through and combination with the rubber material of the sole, capable of decreasing the weight of the metal properly and increasing the actual bond strength of the rubber material. A central spike rod 13 connected with the top end plate 11 is a straight rod, and a premade middle plate 14 with a diameter slightly smaller than the top end plate 11 is put around the central spike rod 13 to a location thereof having a distance from the top end plate 11, where the middle plate 14 may be premade with a punched-out through hole 141 for the insertion of the central spike rod 13 at the center thereof, the edge surface of the through hole 141 forming a flange face 142 extended out toward the other side, and the projected height of the flange face 142 being formed naturally into a spacing limitation between the middle plate 14 and the end plate 11 while the middle plate is inserted in and allowing the middle plate 14 to be propped against the end plate 11 and thus to be positioned, allowing the two plates to be spaced apart from each other with a stable distance naturally to form a double-layer top plate edge-typed body; the distance between the two plates is preferably ranged from 1.0 to 3.5 mm. Furthermore, the central spike 13 is extended downward by a proper length, and the bottom thereof is further extended with a thinner protruded head rod 15, thereby forming a complete spike structure with an anti-take off effect. Furthermore, the outer edge of the entire spike body 11 is carried out with a roughening treatment, witch is similar to the roughening treatment carried out on the surfaces of conventional metal spikes, and in which chemical is used for soaking and cleaning or a machine is used to the roughening of the spike surface, allowing the spike surface to be in comprehensive contact and combination with rubber material, where the top end plate 11 of the spike body 10 is similar to a metal spike head. When the entire central spike rod 13 is assembled with the preformed middle plate 14, which has the punched passed-through insertion through hole at the center of the plate surface of the middle plate 14 and the annular protruded flange surface 142 formed by punched-out surplus, the protruded top end edge can be propped against the bottom face of the end plate 11 exactly and thereby positioned after the insertion, forming an assembly thereof with a fixed spacing between the two plates. According to this, the diameter of the insertion hole is set to be the same as or slightly smaller than the one of the rod, allowing the middle plate not to drop down, and further allowing the sole primer to fill in completely between the two plates, thereby achieving the anti-take off and cushioning effects of a double-wide plate upon the use of the spike naturally and thus achieving the anti-take off use effect and object of the nonskid spike accurately.

In an alternative embodiment, an elastic element 16 with a larger annular diameter is used to replace the middle plate 14 mentioned above as shown in FIGS. 5 and 6. The elastic element 16 is a spiral spring for example, which is put around the spike rod 12 to prop against the bottom edge of the end plate 11 and thereby positioned; uneven cladding interval restriction outside the rod surface is formed by putting the elastic element 16 around the upper half of the rod, allowing the rubber material to penetrate to covering the entire assembled interval between the elastic element 16 and spike rod 13, thereby achieving the same integration and metally-hard supporting and positioning assistance effect as the separate plate faces mentioned above, and thus also preventing the spike from taking off the sole to achieving the nonskid and use safety effects. In addition, the central spike rod 12 may be made in advance as FIGS. 7 and 8 show; the spike rod 13 is set to a stepped rod, and middle section thereof is configured with a step end edge allowing the middle plate 14 with an annular diameter slightly smaller than the one of the end plate 11 to be put around the end plated to prop against the step end edge and thereby positioned, allowing a proper spacing to be formed between the two plates naturally to form a double-layer top plate edge together. When the central spike rod 13 is set to be a stepped rod with different diameter, the central insertion through hole on the plate face of the premade central plate 14 with a diameter slightly smaller than the one of the spike rod cooperating with incision lines 143 for hole expansion allows the middle plate 14 to be forced to put around the spike rod 13 independently downwardly from the bottom end thereof to prop against the middle section step edge face, thereby achieving the passed-through and separate positioning to form a spike head type with a double wide plate edge; cooperating with the separate double-layer plate edge allows the spike body 10 to be grasped easily to insert in the accepting groove 22 inside the sole mold 21 to integrate with the sole boy 20. Furthermore, the top end plate 11 and middle plate 14 spaced apart vertically can achieve a double anti-take off and therefore coupling positioning effect after the sole rubber material is filled in and cover them accurately, ensuring that the combination of the spike body 10 with the sole body 20 is firm and accurate. Whereby, thinner protruded spike head rods 15 of a shoe can inserted in and engaged with an icy ground surface when the shoe treads on the ground, thereby achieving the nonskid and thus safety effect while the shoe is worn. In addition, a nonskid secondary effect can be achieve accurately while the shoe treads on a snow ground or particular rocky surface due to the grip thereof is strong. The present invention can solve the problem of a single spike plate face being deflected and even taken off when the sole is put into a mold and positioned and the spike plate may be subjected to a local uneven force resulted from the prior art; the problem mentioned here might cause a unsafe use. Moreover, the spike of the present invention is not deflected or displaced, when the sole is molded by means of compression such that the product yield is increased, allowing the nonskid effect of the spike to be brought into a full play.

The present invention is characterized in that the top edge of the nonskid spike body 10 is formed with a large top end plate 11 cooperating with the top end of the central spike rod 13 being assembled with the middle plate 14 by spacing the end plate 11 apart therefrom and through the respective simple positioning and engagement assembly with the protruded-out of stepped end face of the premade flange surface 142 or elastic element 16 to form a double-layer top plate edge type of spike assembly. Furthermore, the central spike rod 13 is extended downward to form a bottom-end thinner protruded spike head rod 15, thereby forming a complete nonskid spike structure with an anti-take off effect. In the whole spike structure, the middle plate 14 can be punched, combined, formed and positioned automatically and simply through a machine after being preformed, and the spike can be placed in a sole mold accurately and simply only by grasping the double-layer plate edge accurately. Furthermore, sole rubber material can cover the spike body 10 directly after the spike body 10 is integrated with the rubber sole. Especially, a segmented force structure combination is formed effectively between two spaced plates through a design of cushioning element such as rubber material, elastic element 10, allowing the spike to be combined with the sole and fixed firmly without being taken off when the spike head rod 15 thereof treads on a ground and is objet to a reacting force due to the rubber spaced cushioning combination design of the top end plate 11 and middle plate 14 of the top metal plate face double-layer spacing arrangement. Moreover, when the spike head rod 15 treading on a ground causes a larger local reacting force, the spike will not press up the bottom face of the sole where a human's foot is located to form a substantial swell to influence the foot wearing comfort. 

I claim:
 1. A nonskid spike structure, comprising a spike body premade of metal, capable of being integrated with a rubber sole body and used for nonskid purpose, and a spike head rod protruded from a bottom end thereof, wherein a top end of a central spike rod of said spike body is configured with a top end plate, a middle plate spaced apart from said top end plate is put around a middle section of said spike rod and thus positioned, thereby forming said anti-take off spike structure with a double-layer spaced large head plate edge.
 2. The structure according to claim 1, wherein a through hole is opened at a center of said middle plate, and a protruded annular flange surface is formed on one side of said middle plate for insertion, pressing against and positioning.
 3. The structure according to claim 1, wherein said spike rod is set to a stepped rod type, allowing said middle plate to be engaged with and positioned at a stepped end edge.
 4. The structure according to claim 1, wherein an elastic element is put around a upper half section of said spike rod at a lower edge of said top end plate.
 5. The structure according to claim 1, wherein spacing between said top end plate and middle plate is ranged from 1.0 to 3.5 mm.
 6. The structure according to claim 1, wherein equally separate through holes are configured on a plate face of said end plate.
 7. The structure according to claim 2, wherein equally separate incision lines for hole expansion are configured on said through hole at said center of said middle plate. 